But there was a strip between my house and my neighbor's house that was very narrow and difficult to keep watered. It was rather brown and could have been the cause of the letter. Who knows.
So, I dug all the grass out and put in some plants that might be tolerant of less water, and covered the area with landscaping cloth and bark to try to keep in some moisture.
This is what it looked like last October.
And, this spring ... in May.